#login {
  width: 100vw;
  height: 100vh;
  background: url('../img/1.jpg') no-repeat;
  background-size: 100% 100%;
}
#login .form {
  width: 600px;
  height: 200px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}
